From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 82431] New: Garbled screen on boot
Date: Fri, 15 Aug 2014 04:34:08 +0000
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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
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
Cc: 3.13 # 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)
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