https://bugzilla.kernel.org/show_bug.cgi?id=82431
Bug ID: 82431 Summary: Garbled screen on boot Product: Drivers Version: 2.5 Kernel Version: All after 3.13.6-20 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: fedevx@yahoo.com Regression: No
When using any kernel higher than 3.13.6-20 (all the way to 3.16), my Toshiba M840's screen gets garbled after Grub (grub itself is fine).
In particular, because my whole drive is encrypted, I see the garbled screen when the prompt for the encryption key comes up.
I have the issue with my OpenSUSE installation and when booting off Archlinux's installer.
I'm not sure if this is relevant but this happens on UEFI, if I change the setting back to BIOS compatibility, at least on the Archlinux's installer, the issue goes away. I can't test this on OpenSUSE since it is already set to UEFI and will not boot on BIOS compatibility mode.
The issue has quite an impact since I can't bootup in a usable way, any Linux distribution with a kernel newer than the one stated above.
I did a kernel bisect and found the below commit to be the cause of the issue:
[919cf555c04e16dafb1fba56904eb23889a812c3] drm/radeon: disable dpm on BTC 919cf555c04e16dafb1fba56904eb23889a812c3 is the first bad commit commit 919cf555c04e16dafb1fba56904eb23889a812c3 Author: Alex Deucher alexander.deucher@amd.com Date: Sat Jan 11 10:55:55 2014 -0500
drm/radeon: disable dpm on BTC
Still unstable on some boards.
Bugs: https://bugs.freedesktop.org/show_bug.cgi?id=73053 https://bugzilla.kernel.org/show_bug.cgi?id=68571
Signed-off-by: Alex Deucher alexander.deucher@amd.com Cc: 3.13 stable@vger.kernel.org # 3.13
:040000 040000 c03cf693d8be0e49e0b431b968c4934324344d57 f4fa27f78f5ff03216036f8bcdc3978b274b812f M drivers
Thanks!
Details about my GFX card:
21: PCI 100.0: 0300 VGA compatible controller (VGA) [Created at pci.319] Unique ID: VCu0.dkF2+KIVH8C Parent ID: vSkL.zuRwVyuZRN1 SysFS ID: /devices/pci0000:00/0000:00:01.0/0000:01:00.0 SysFS BusID: 0000:01:00.0 Hardware Class: graphics card Model: "ATI VGA compatible controller" Vendor: pci 0x1002 "ATI Technologies Inc" Device: pci 0x6840 SubVendor: pci 0x1179 "Toshiba America Info Systems" SubDevice: pci 0xfb81 Driver: "radeon" Driver Modules: "drm" Memory Range: 0xb0000000-0xbfffffff (ro,non-prefetchable) Memory Range: 0xc0000000-0xc001ffff (rw,non-prefetchable) I/O Ports: 0x3000-0x3fff (rw) Memory Range: 0xc0040000-0xc005ffff (ro,non-prefetchable,disabled) IRQ: 43 (76519 events) Module Alias: "pci:v00001002d00006840sv00001179sd0000FB81bc03sc00i00" Driver Info #0: Driver Status: radeon is active Driver Activation Cmd: "modprobe radeon" Config Status: cfg=new, avail=yes, need=no, active=unknown Attached to: #9 (PCI bridge) -----------