[Bug 82431] New: Garbled screen on boot

[Bug 82431] New: Garbled screen on boot

[bugzilla-daemon]

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)
-----------

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[Bug 82431] Garbled screen on boot

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=82431

--- Comment #1 from Fede <fedevx@yahoo.com> ---
Created attachment 146691
  --> https://bugzilla.kernel.org/attachment.cgi?id=146691&action=edit
Image of issue

At times only a thin dotted line can be seen on the top, other times the
content is displayed flickering, starting from the center of the screen and
wrapped around the screen from right to left. When it does not flicker, the
screen looks as shown in the attachment.

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[Bug 82431] Garbled screen on boot

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=82431

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #2 from Alex Deucher <alexdeucher@gmail.com> ---
I doubt that commit is the problematic one.  However, you can revert to the
previous behavior by passing radeon.dpm=1 on the kernel command line in grub.

This looks like a duplicate of:
https://bugs.freedesktop.org/show_bug.cgi?id=43655
Does your grub config have GRUB_GFXPAYLOAD_LINUX=keep in it?  If so, does
removing that help?

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[Bug 82431] Garbled screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=82431

--- Comment #3 from Fede <fedevx@yahoo.com> ---
Hi Alex,

In deed, adding radeon.dpm=1 works. I tested it after submitting the bug report
since I went thru what the actual patch changed. Currently running kernel
3.16.0-5 and it works as long as radeon.dpm=1 is passed to the kernel. 

GRUB_GFXPAYLOAD_LINUX=keep (nor text) did make any difference.

Can this be permanently fixed for everyone affected?

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[Bug 82431] Garbled screen on boot

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=82431

--- Comment #4 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Fede from comment #3)
> Hi Alex,
> 
> In deed, adding radeon.dpm=1 works.

> Can this be permanently fixed for everyone affected?

The issues with dpm on btc asics were fixed in 3.16 and it's enabled again on
those asics in 3.17.

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[Bug 82431] Garbled screen on boot

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=82431

--- Comment #5 from Fede <fedevx@yahoo.com> ---
So the issue is fixed in 3.17? Using that kernel I should not need to use
radeon.dpm=1 anymore?

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[Bug 82431] Garbled screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=82431

--- Comment #6 from Alex Deucher <alexdeucher@gmail.com> ---
dpm is enabled by default in 3.17 so you don't need to append radeon.dpm=1
anymore to enable it.

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[Bug 82431] Garbled screen on boot

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=82431

Fede (fedevx@yahoo.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |CODE_FIX

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