------------------ 原始邮件 ------------------
Jesse
On 03/21/2015 12:46 AM, Bģʽ// wrote:
- hi Barnes： the kernel driver is failing to get the EDID from the DVI attached
monitor . I print the drm_get_edid() function ret val on two different kernel versionn 2.6.32-131 and 2.6.32-358(this version kernel can work normally) ，i find the ret val is different ,and i think EDID should be same for one monitor. the log on different kernel version as shown blow : ================================================================= this is 2.6.32-131 kernel driver log about DRM： [drm] Initialized drm 1.1.0 20060810 [drm] radeon defaulting to kernel modesetting. [drm] radeon kernel modesetting enabled. NUM[.1.] [drm_pci_init]... PCI: Setting latency timer of device 0000:01:05.0 to 64 [drm] initializing kernel modesetting (RS780 0x1002:0x9615). -->swiotlb_dma_supported(0x872fffff, 0xffffffffff) [drm] rdev->need_dma32: 0 [drm] register mmio base: 0x48000000 [drm] register mmio size: 65536 ATOM BIOS: 113 radeon 0000:01:05.0: VRAM: 128M 0x0000000040000000 - 0x0000000047FFFFFF (128M used) radeon 0000:01:05.0: GTT: 512M 0x0000000048000000 - 0x0000000067FFFFFF [drm:rs690_pm_info] *ERROR* No integrated system info for your GPU, using safe default [drm:radeon_atombios_sideport_present] *ERROR* Unsupported IGP table: 1 4 [drm] Detected VRAM RAM=128M, BAR=128M [drm] RAM width 32bits DDR [TTM] Zone kernel: Available graphics memory: 2017416 kiB. [TTM] Initializing pool allocator. [drm] radeon: 128M of VRAM memory ready [drm] radeon: 512M of GTT memory ready. [drm] radeon: irq initialized. [drm] GART: num cpu pages 32768, num gpu pages 131072 [drm] Loading RS780 Microcode platform radeon_cp.0: firmware: using built-in firmware radeon/RS780_pfp.bin platform radeon_cp.0: firmware: using built-in firmware radeon/RS780_me.bin platform radeon_cp.0: firmware: using built-in firmware radeon/R600_rlc.bin radeon 0000:01:05.0: WB enabled [drm] ring test succeeded in 0 usecs [drm] radeon: ib pool ready. [drm] ib test succeeded in 0 usecs [drm] Enabling audio support [drm] Radeon Display Connectors [drm] Connector 0: [drm] VGA [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c [drm] Encoders: [drm] CRT1: INTERNAL_KLDSCP_DAC1 [drm] Connector 1: [drm] DVI-D [drm] HPD3 [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c [drm] Encoders: [drm] DFP3: INTERNAL_KLDSCP_LVTMA [drm-cs] drm_get_edid() func .. edid=980000017e8e5a00 [drm-cs] drm_get_edid() func .. edid=980000017e86ac80 [drm-cs] drm_get_edid() func .. edid=980000017e8e5a00 [drm] -->> timing->pixel_clock= 14850 [drm] cs---->>>mode->type=64 cs->> mode->clock=148500 cs->> mode->hdisplay=1920 cs->> mode->hsync_start=2008 cs->> mode->hsync_end=2052 cs->> mode->htotal=2200 cs->> mode->vdisplay=1080 cs->> mode->vsync_start=1084 cs->> mode->vsync_end=1089 cs->> mode->vtotal=1125 [drm] drm_mode_set_name func ... [drm] -->> timing->pixel_clock= 0 [drm] -->> timing->pixel_clock= 0 [drm] -->> timing->pixel_clock= 0 [drm] drm_mode_set_name func ... [drm-cs] drm_get_edid() func .. edid=980000017e869a80 [drm] -->> timing->pixel_clock= 10650 [drm] cs---->>>mode->type=64 cs->> mode->clock=106500 cs->> mode->hdisplay=1440 cs->> mode->hsync_start=1520 cs->> mode->hsync_end=1672 cs->> mode->htotal=1904 cs->> mode->vdisplay=900 cs->> mode->vsync_start=903 cs->> mode->vsync_end=909 cs->> mode->vtotal=934 [drm] drm_mode_set_name func ... [drm] -->> timing->pixel_clock= 0 [drm] -->> timing->pixel_clock= 0 [drm] -->> timing->pixel_clock= 0 [drm] -->> timing->pixel_clock= 7425 [drm] cs---->>>mode->type=64 cs->> mode->clock=74250 cs->> mode->hdisplay=1920 cs->> mode->hsync_start=2448 cs->> mode->hsync_end=2492 cs->> mode->htotal=2640 cs->> mode->vdisplay=540 cs->> mode->vsync_start=542 cs->> mode->vsync_end=547 cs->> mode->vtotal=562 [drm] drm_mode_set_name func ... [drm] fb mappable at 0x40144000 [drm] vram apper at 0x40000000 [drm] size 4161536 [drm] fb depth is 16 [drm] pitch is 3840 Console: switching to colour frame buffer device 180x56 fb0: radeondrmfb frame buffer device drm: registered panic notifier ================================================================================
### this is 2.6.32-358 kernel driver log about DRM，there is some log more info： ================================================================================ [drm] Initialized drm 1.1.0 20060810 [drm] radeon defaulting to kernel modesetting. [drm] radeon kernel modesetting enabled. [drm] initializing kernel modesetting (RS780 0x1002:0x9615 0x1002:0x0000). -->swiotlb_dma_supported(0x8855bfff, 0xffffffffff) -->swiotlb_dma_supported(0x8855bfff, 0xffffffffff) [drm] register mmio base: 0x48000000 [drm] register mmio size: 65536 ATOM BIOS: 113 radeon 0000:01:05.0: VRAM: 128M 0x0000000040000000 - 0x0000000047FFFFFF (128M used) radeon 0000:01:05.0: GTT: 512M 0x0000000048000000 - 0x0000000067FFFFFF [drm:rs690_pm_info] *ERROR* No integrated system info for your GPU, using safe default [drm:radeon_atombios_sideport_present] *ERROR* Unsupported IGP table: 1 4 [drm] Detected VRAM RAM=128M, BAR=128M [drm] RAM width 32bits DDR [TTM] Zone kernel: Available graphics memory: 2008016 kiB [TTM] Initializing pool allocator [TTM] Initializing DMA pool allocator [drm] radeon: 128M of VRAM memory ready [drm] radeon: 512M of GTT memory ready. [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). [drm] Driver supports precise vblank timestamp query. [drm] radeon: irq initialized. [drm] GART: num cpu pages 32768, num gpu pages 131072 [drm] Loading RS780 Microcode platform radeon_cp.0: firmware: using built-in firmware radeon/RS780_pfp.bin platform radeon_cp.0: firmware: using built-in firmware radeon/RS780_me.bin platform radeon_cp.0: firmware: using built-in firmware radeon/R600_rlc.bin [drm] PCIE GART of 512M enabled (table at 0x0000000040040000). radeon 0000:01:05.0: WB enabled radeon 0000:01:05.0: fence driver on ring 0 use gpu addr 0x0000000048000c00 and cpu addr 0x980000017fd48c00 PCI: Setting latency timer of device 0000:01:05.0 to 64 [drm] ring test on 0 succeeded in 0 usecs [drm] ib test on ring 0 succeeded in 0 usecs [drm] Radeon Display Connectors [drm] Connector 0: [drm] VGA-1 [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c [drm] Encoders: [drm] CRT1: INTERNAL_KLDSCP_DAC1 [drm] Connector 1: [drm] DVI-D-1 [drm] HPD3 [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c [drm] Encoders: [drm] DFP3: INTERNAL_KLDSCP_LVTMA [drm] Try to fetch EDID information by calling i2c driver function. drm_do_probe_ddc_edid().. [drm] Try to fetch EDID information by calling i2c driver function. drm_do_probe_ddc_edid().. [drm] drm_get_edid() func .. edid=980000017fd3dc00 [drm--lonxin] -->> timing->pixel_clock= 14850 [drm--loongson]-->>>mode->clock=148500 [drm--loongson]-->>>mode->display=1920 [drm-loongson]-->>>mode->vdisplay=1080 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 0 [drm--lonxin] -->> timing->pixel_clock= 0 [drm--lonxin] -->> timing->pixel_clock= 0 [drm] Try to fetch EDID information by calling i2c driver function. drm_do_probe_ddc_edid().. [drm] Try to fetch EDID information by calling i2c driver function. drm_do_probe_ddc_edid().. [drm] Try to fetch EDID information by calling i2c driver function. drm_do_probe_ddc_edid().. [drm] drm_get_edid() func .. edid=980000017f953280 [drm--lonxin] -->> timing->pixel_clock= 10650 [drm--loongson]-->>>mode->clock=106500 [drm--loongson]-->>>mode->display=1440 [drm-loongson]-->>>mode->vdisplay=900 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 0 [drm--lonxin] -->> timing->pixel_clock= 0 [drm--lonxin] -->> timing->pixel_clock= 0 [drm--lonxin] -->> timing->pixel_clock= 7425 [drm--loongson]-->>>mode->clock=74250 [drm--loongson]-->>>mode->display=1920 [drm-loongson]-->>>mode->vdisplay=540 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 7425 [drm--loongson]-->>>mode->clock=74250 [drm--loongson]-->>>mode->display=1920 [drm-loongson]-->>>mode->vdisplay=540 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 7425 [drm--loongson]-->>>mode->clock=74250 [drm--loongson]-->>>mode->display=1280 [drm-loongson]-->>>mode->vdisplay=720 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 2700 [drm--loongson]-->>>mode->clock=27000 [drm--loongson]-->>>mode->display=720 [drm-loongson]-->>>mode->vdisplay=576 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 2700 [drm--loongson]-->>>mode->clock=27000 [drm--loongson]-->>>mode->display=720 [drm-loongson]-->>>mode->vdisplay=480 [drm]--->>>mode->type=64 [drm] fb mappable at 0x40148000 [drm] vram apper at 0x40000000 [drm] size 8306688 [drm] fb depth is 24 [drm] pitch is 7680 Console: switching to colour frame buffer device 180x56 fb0: radeondrmfb frame buffer device drm: registered panic notifier ===================================================================================== and i wanna know if there is some thing wrong ,if the problem is here ,how can i solve on kernel 2.6.32-131
Thanks, xiezhongtian
------------------ 原始邮件 ------------------ *发件人:* "jesse.barnes"jesse.barnes@intel.com; *发送时间:* 2015年3月21日(星期六) 凌晨3:45 *收件人:* "B模式//"377953829@qq.com; *主题:* Re: DVI to VGA convertor cause a problem，
On 03/20/2015 12:25 AM, B模式// wrote:
hi ，Barnes： now, i met a problem about DVI on kernel-2.6.32-131, Now situation is like that, I have two monitors.Demand is through two vga devices to connect to the monitor. but you know, i have a vga and dvi output , so i use a DVI to VGA convertor ,But after the converter display not lit up. Because some other development is based on this version of the kernel, so only on the kernel version development.
There could be a few things going on:
- DVI adapter isn't a DVI-I adapter, which includes the VGA interface
- the DVI port doesn't support DVI-I
- the kernel driver is failing to get the EDID from the DVI attached monitor
and possibly other bugs.
Can you file a bug at bugs.freedesktop.org if you don't figure things out? You can use https://01.org/linuxgraphics/documentation/how-report-bugs https://01.org/linuxgraphics/documentation/how-report-bugs to help you collect the info we need.
Thanks, Jesse
[drm] Radeon Display Connectors [drm] Connector 0: [drm] VGA-1 [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c [drm] Encoders: [drm] CRT1: INTERNAL_KLDSCP_DAC1 [drm] Connector 1: [drm] DVI-D-1 [drm] HPD3 [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c [drm] Encoders: [drm] DFP3: INTERNAL_KLDSCP_LVTMA
Your board has a DVI-D port (not DVI-I) so there are no analog pins connected on the DVI port. It's digital only. You can't use a DVI to VGA convertor on DVI-D, it will only work on DVI-I ports.
Alex
On Mon, Mar 23, 2015 at 11:54 AM, B模式// 377953829@qq.com wrote:
------------------ 原始邮件 ------------------
Jesse
On 03/21/2015 12:46 AM, Bģʽ// wrote:
- hi Barnes： the kernel driver is failing to get the EDID from the DVI attached
monitor . I print the drm_get_edid() function ret val on two different kernel versionn 2.6.32-131 and 2.6.32-358(this version kernel can work normally) ，i find the ret val is different ,and i think EDID should be same for one monitor. the log on different kernel version as shown blow : ================================================================= this is 2.6.32-131 kernel driver log about DRM： [drm] Initialized drm 1.1.0 20060810 [drm] radeon defaulting to kernel modesetting. [drm] radeon kernel modesetting enabled. NUM[.1.] [drm_pci_init]... PCI: Setting latency timer of device 0000:01:05.0 to 64 [drm] initializing kernel modesetting (RS780 0x1002:0x9615). -->swiotlb_dma_supported(0x872fffff, 0xffffffffff) [drm] rdev->need_dma32: 0 [drm] register mmio base: 0x48000000 [drm] register mmio size: 65536 ATOM BIOS: 113 radeon 0000:01:05.0: VRAM: 128M 0x0000000040000000 - 0x0000000047FFFFFF (128M used) radeon 0000:01:05.0: GTT: 512M 0x0000000048000000 - 0x0000000067FFFFFF [drm:rs690_pm_info] *ERROR* No integrated system info for your GPU, using safe default [drm:radeon_atombios_sideport_present] *ERROR* Unsupported IGP table: 1 4 [drm] Detected VRAM RAM=128M, BAR=128M [drm] RAM width 32bits DDR [TTM] Zone kernel: Available graphics memory: 2017416 kiB. [TTM] Initializing pool allocator. [drm] radeon: 128M of VRAM memory ready [drm] radeon: 512M of GTT memory ready. [drm] radeon: irq initialized. [drm] GART: num cpu pages 32768, num gpu pages 131072 [drm] Loading RS780 Microcode platform radeon_cp.0: firmware: using built-in firmware radeon/RS780_pfp.bin platform radeon_cp.0: firmware: using built-in firmware radeon/RS780_me.bin platform radeon_cp.0: firmware: using built-in firmware radeon/R600_rlc.bin radeon 0000:01:05.0: WB enabled [drm] ring test succeeded in 0 usecs [drm] radeon: ib pool ready. [drm] ib test succeeded in 0 usecs [drm] Enabling audio support [drm] Radeon Display Connectors [drm] Connector 0: [drm] VGA [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c [drm] Encoders: [drm] CRT1: INTERNAL_KLDSCP_DAC1 [drm] Connector 1: [drm] DVI-D [drm] HPD3 [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c [drm] Encoders: [drm] DFP3: INTERNAL_KLDSCP_LVTMA [drm-cs] drm_get_edid() func .. edid=980000017e8e5a00 [drm-cs] drm_get_edid() func .. edid=980000017e86ac80 [drm-cs] drm_get_edid() func .. edid=980000017e8e5a00 [drm] -->> timing->pixel_clock= 14850 [drm] cs---->>>mode->type=64 cs->> mode->clock=148500 cs->> mode->hdisplay=1920 cs->> mode->hsync_start=2008 cs->> mode->hsync_end=2052 cs->> mode->htotal=2200 cs->> mode->vdisplay=1080 cs->> mode->vsync_start=1084 cs->> mode->vsync_end=1089 cs->> mode->vtotal=1125 [drm] drm_mode_set_name func ... [drm] -->> timing->pixel_clock= 0 [drm] -->> timing->pixel_clock= 0 [drm] -->> timing->pixel_clock= 0 [drm] drm_mode_set_name func ... [drm-cs] drm_get_edid() func .. edid=980000017e869a80 [drm] -->> timing->pixel_clock= 10650 [drm] cs---->>>mode->type=64 cs->> mode->clock=106500 cs->> mode->hdisplay=1440 cs->> mode->hsync_start=1520 cs->> mode->hsync_end=1672 cs->> mode->htotal=1904 cs->> mode->vdisplay=900 cs->> mode->vsync_start=903 cs->> mode->vsync_end=909 cs->> mode->vtotal=934 [drm] drm_mode_set_name func ... [drm] -->> timing->pixel_clock= 0 [drm] -->> timing->pixel_clock= 0 [drm] -->> timing->pixel_clock= 0 [drm] -->> timing->pixel_clock= 7425 [drm] cs---->>>mode->type=64 cs->> mode->clock=74250 cs->> mode->hdisplay=1920 cs->> mode->hsync_start=2448 cs->> mode->hsync_end=2492 cs->> mode->htotal=2640 cs->> mode->vdisplay=540 cs->> mode->vsync_start=542 cs->> mode->vsync_end=547 cs->> mode->vtotal=562 [drm] drm_mode_set_name func ... [drm] fb mappable at 0x40144000 [drm] vram apper at 0x40000000 [drm] size 4161536 [drm] fb depth is 16 [drm] pitch is 3840 Console: switching to colour frame buffer device 180x56 fb0: radeondrmfb frame buffer device drm: registered panic notifier
================================================================================
### this is 2.6.32-358 kernel driver log about DRM，there is some log more info：
================================================================================ [drm] Initialized drm 1.1.0 20060810 [drm] radeon defaulting to kernel modesetting. [drm] radeon kernel modesetting enabled. [drm] initializing kernel modesetting (RS780 0x1002:0x9615 0x1002:0x0000). -->swiotlb_dma_supported(0x8855bfff, 0xffffffffff) -->swiotlb_dma_supported(0x8855bfff, 0xffffffffff) [drm] register mmio base: 0x48000000 [drm] register mmio size: 65536 ATOM BIOS: 113 radeon 0000:01:05.0: VRAM: 128M 0x0000000040000000 - 0x0000000047FFFFFF (128M used) radeon 0000:01:05.0: GTT: 512M 0x0000000048000000 - 0x0000000067FFFFFF [drm:rs690_pm_info] *ERROR* No integrated system info for your GPU, using safe default [drm:radeon_atombios_sideport_present] *ERROR* Unsupported IGP table: 1 4 [drm] Detected VRAM RAM=128M, BAR=128M [drm] RAM width 32bits DDR [TTM] Zone kernel: Available graphics memory: 2008016 kiB [TTM] Initializing pool allocator [TTM] Initializing DMA pool allocator [drm] radeon: 128M of VRAM memory ready [drm] radeon: 512M of GTT memory ready. [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). [drm] Driver supports precise vblank timestamp query. [drm] radeon: irq initialized. [drm] GART: num cpu pages 32768, num gpu pages 131072 [drm] Loading RS780 Microcode platform radeon_cp.0: firmware: using built-in firmware radeon/RS780_pfp.bin platform radeon_cp.0: firmware: using built-in firmware radeon/RS780_me.bin platform radeon_cp.0: firmware: using built-in firmware radeon/R600_rlc.bin [drm] PCIE GART of 512M enabled (table at 0x0000000040040000). radeon 0000:01:05.0: WB enabled radeon 0000:01:05.0: fence driver on ring 0 use gpu addr 0x0000000048000c00 and cpu addr 0x980000017fd48c00 PCI: Setting latency timer of device 0000:01:05.0 to 64 [drm] ring test on 0 succeeded in 0 usecs [drm] ib test on ring 0 succeeded in 0 usecs [drm] Radeon Display Connectors [drm] Connector 0: [drm] VGA-1 [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c [drm] Encoders: [drm] CRT1: INTERNAL_KLDSCP_DAC1 [drm] Connector 1: [drm] DVI-D-1 [drm] HPD3 [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c [drm] Encoders: [drm] DFP3: INTERNAL_KLDSCP_LVTMA [drm] Try to fetch EDID information by calling i2c driver function. drm_do_probe_ddc_edid().. [drm] Try to fetch EDID information by calling i2c driver function. drm_do_probe_ddc_edid().. [drm] drm_get_edid() func .. edid=980000017fd3dc00 [drm--lonxin] -->> timing->pixel_clock= 14850 [drm--loongson]-->>>mode->clock=148500 [drm--loongson]-->>>mode->display=1920 [drm-loongson]-->>>mode->vdisplay=1080 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 0 [drm--lonxin] -->> timing->pixel_clock= 0 [drm--lonxin] -->> timing->pixel_clock= 0 [drm] Try to fetch EDID information by calling i2c driver function. drm_do_probe_ddc_edid().. [drm] Try to fetch EDID information by calling i2c driver function. drm_do_probe_ddc_edid().. [drm] Try to fetch EDID information by calling i2c driver function. drm_do_probe_ddc_edid().. [drm] drm_get_edid() func .. edid=980000017f953280 [drm--lonxin] -->> timing->pixel_clock= 10650 [drm--loongson]-->>>mode->clock=106500 [drm--loongson]-->>>mode->display=1440 [drm-loongson]-->>>mode->vdisplay=900 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 0 [drm--lonxin] -->> timing->pixel_clock= 0 [drm--lonxin] -->> timing->pixel_clock= 0 [drm--lonxin] -->> timing->pixel_clock= 7425 [drm--loongson]-->>>mode->clock=74250 [drm--loongson]-->>>mode->display=1920 [drm-loongson]-->>>mode->vdisplay=540 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 7425 [drm--loongson]-->>>mode->clock=74250 [drm--loongson]-->>>mode->display=1920 [drm-loongson]-->>>mode->vdisplay=540 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 7425 [drm--loongson]-->>>mode->clock=74250 [drm--loongson]-->>>mode->display=1280 [drm-loongson]-->>>mode->vdisplay=720 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 2700 [drm--loongson]-->>>mode->clock=27000 [drm--loongson]-->>>mode->display=720 [drm-loongson]-->>>mode->vdisplay=576 [drm]--->>>mode->type=64 [drm--lonxin] -->> timing->pixel_clock= 2700 [drm--loongson]-->>>mode->clock=27000 [drm--loongson]-->>>mode->display=720 [drm-loongson]-->>>mode->vdisplay=480 [drm]--->>>mode->type=64 [drm] fb mappable at 0x40148000 [drm] vram apper at 0x40000000 [drm] size 8306688 [drm] fb depth is 24 [drm] pitch is 7680 Console: switching to colour frame buffer device 180x56 fb0: radeondrmfb frame buffer device drm: registered panic notifier
===================================================================================== and i wanna know if there is some thing wrong ,if the problem is here ,how can i solve on kernel 2.6.32-131
Thanks, xiezhongtian
------------------ 原始邮件 ------------------ *发件人:* "jesse.barnes"jesse.barnes@intel.com; *发送时间:* 2015年3月21日(星期六) 凌晨3:45 *收件人:* "B模式//"377953829@qq.com; *主题:* Re: DVI to VGA convertor cause a problem，
On 03/20/2015 12:25 AM, B模式// wrote:
hi ，Barnes： now, i met a problem about DVI on kernel-2.6.32-131, Now situation is like that, I have two monitors.Demand is through two vga devices to connect to the monitor. but you know, i have a vga and dvi output , so i use a DVI to VGA convertor ,But after the converter display not lit up. Because some other development is based on this version of the kernel, so only on the kernel version development.
There could be a few things going on:
- DVI adapter isn't a DVI-I adapter, which includes the VGA interface
- the DVI port doesn't support DVI-I
- the kernel driver is failing to get the EDID from the DVI attached monitor
and possibly other bugs.
Can you file a bug at bugs.freedesktop.org if you don't figure things out? You can use https://01.org/linuxgraphics/documentation/how-report-bugs https://01.org/linuxgraphics/documentation/how-report-bugs to help you collect the info we need.
Thanks, Jesse
dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel
dri-devel@lists.freedesktop.org
-
Alex Deucher -
B模式//