https://bugs.freedesktop.org/show_bug.cgi?id=35502

Summary: Regression: black screen with Radeon KMS in 2.6.38 (2.6.37.4 worked fine) Product: DRI Version: unspecified Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: major Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: john.lindgren@tds.net

Created an attachment (id=44669) --> (https://bugs.freedesktop.org/attachment.cgi?id=44669) Kernel log

With Linux kernel 2.6.38, loading the radeon module causes the console to go completely blank (laptop backlight on, but nothing displayed). The system still responds to ctrl-alt-del and reboots. This is a regression from the previous kernel, 2.6.37.4, where kernel mode setting works flawlessly.

With radeon.modeset=0, or with the module blacklisted, the system boots fine, and I can use X, but without the powersaving features available through KMS.

System: Toshiba Satellite A305-S6916 Graphics: ATI Radeon Mobility HD 3650 Kernel: 2.6.38 (x86_64)

Kernel log when loading the module:

Mar 21 00:57:38 localhost kernel: [drm] Initialized drm 1.1.0 20060810 Mar 21 00:57:38 localhost kernel: [drm] radeon defaulting to kernel modesetting. Mar 21 00:57:38 localhost kernel: [drm] radeon kernel modesetting enabled. Mar 21 00:57:38 localhost kernel: radeon 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 Mar 21 00:57:38 localhost kernel: radeon 0000:01:00.0: setting latency timer to 64 Mar 21 00:57:38 localhost kernel: [drm] initializing kernel modesetting (RV635 0x1002:0x9591). Mar 21 00:57:38 localhost kernel: [drm] register mmio base: 0xD6300000 Mar 21 00:57:38 localhost kernel: [drm] register mmio size: 65536 Mar 21 00:57:38 localhost kernel: ATOM BIOS: Tosh_IEC_Potomac_M86_DDR2 Mar 21 00:57:38 localhost kernel: radeon 0000:01:00.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M used) Mar 21 00:57:38 localhost kernel: radeon 0000:01:00.0: GTT: 512M 0x0000000020000000 - 0x000000003FFFFFFF Mar 21 00:57:38 localhost kernel: [drm] Detected VRAM RAM=512M, BAR=256M Mar 21 00:57:38 localhost kernel: [drm] RAM width 128bits DDR Mar 21 00:57:38 localhost kernel: [TTM] Zone kernel: Available graphics memory: 2027544 kiB. Mar 21 00:57:38 localhost kernel: [TTM] Initializing pool allocator. Mar 21 00:57:38 localhost kernel: [drm] radeon: 512M of VRAM memory ready Mar 21 00:57:38 localhost kernel: [drm] radeon: 512M of GTT memory ready. Mar 21 00:57:38 localhost kernel: [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). Mar 21 00:57:38 localhost kernel: [drm] Driver supports precise vblank timestamp query. Mar 21 00:57:38 localhost kernel: radeon 0000:01:00.0: irq 49 for MSI/MSI-X Mar 21 00:57:38 localhost kernel: radeon 0000:01:00.0: radeon: using MSI. Mar 21 00:57:38 localhost kernel: [drm] radeon: irq initialized. Mar 21 00:57:38 localhost kernel: [drm] GART: num cpu pages 131072, num gpu pages 131072 Mar 21 00:57:38 localhost kernel: [drm] Loading RV635 Microcode Mar 21 00:57:38 localhost kernel: radeon 0000:01:00.0: WB enabled Mar 21 00:57:38 localhost kernel: [drm] ring test succeeded in 1 usecs Mar 21 00:57:38 localhost kernel: [drm] radeon: ib pool ready. Mar 21 00:57:38 localhost kernel: [drm] ib test succeeded in 0 usecs Mar 21 00:57:38 localhost kernel: [drm] Enabling audio support Mar 21 00:57:38 localhost kernel: HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0

If there is any more info I can provide, please ask.