[Bug 47351] New: [KMS: Mobility Radeon HD 6620G] Blank screen on boot

[Bug 47351] New: [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=47351

           Summary: [KMS: Mobility Radeon HD 6620G] Blank screen on boot
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.5.3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: spesialstyrker@gmail.com
        Regression: No


Booting without nomodeset in the kernel parameters results in a blank screen
using 3.5.3 kernel, and same behavior on mainline kernel version as well.

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[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=47351


Alex Deucher <alexdeucher@gmail.com> changed:

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




--- Comment #1 from Alex Deucher <alexdeucher@gmail.com>  2012-09-10 20:19:08 ---
Possibly a duplicate of bug 47321.  Do you have the firmware installed and
accessible in your initrd?  Also possibly related:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=d8636a2717bb3da2a7ce2154bf08de90bb8c87b0
or:
http://lists.freedesktop.org/archives/dri-devel/2012-September/027545.html

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[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=47351





--- Comment #2 from Michael Walton <spesialstyrker@gmail.com>  2012-09-10 20:26:09 ---
Actually I didn't see when I looked before filing the report, but this looks
like my exact situation including the suspend issues. Sorry for the duplicate
report!

https://bugzilla.kernel.org/show_bug.cgi?id=46241

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[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=47351





--- Comment #3 from Michael Walton <spesialstyrker@gmail.com>  2012-09-10 20:29:17 ---
I don't know if it's the same as bug 47321 Mr. Deucher because the system will
boot with KMS enabled, but the screen just stays blank.

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[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=47351





--- Comment #4 from Alex Deucher <alexdeucher@gmail.com>  2012-09-10 20:35:35 ---
(In reply to comment #2)
> Actually I didn't see when I looked before filing the report, but this looks
> like my exact situation including the suspend issues. Sorry for the duplicate
> report!
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=46241

That bug is for a blank screen on resume not boot.  Do you only get a blank
screen on resume, but not boot?  Also, is this a regression?  I.e., did
previous kernels work?  If so, can you bisect?

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[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=47351





--- Comment #5 from Nick <ka.nick@mail.ru>  2013-04-29 12:01:07 ---
Created an attachment (id=100251)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=100251)
lspci -vv output

I have the same behaviour on my HP 4545s laptop if I try to use discrete video
card (HD7500/7600). I managed to get it work (more or less) on integrated
7240G, but I get blank screen having tried to switch to discrete video. Can I
provide any additional information to help to resolve the issue?

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[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=47351





--- Comment #6 from Alex Deucher <alexdeucher@gmail.com>  2013-04-29 14:20:38 ---
(In reply to comment #5)

> I have the same behaviour on my HP 4545s laptop if I try to use discrete video
> card (HD7500/7600). I managed to get it work (more or less) on integrated
> 7240G, but I get blank screen having tried to switch to discrete video. Can I
> provide any additional information to help to resolve the issue?

Most hybrid laptops are mux-less meaning there are no displays physically
connected to the discrete GPU.  For display you have to use the integrated GPU.
 The discrete GPU can only be used for offscreen rendering.  Do display that
rendering, it has to be copied to the integrated GPU.  There is limited support
for this in newer xservers (1.13.x and newer).

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[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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Nick <ka.nick@mail.ru> changed:

           What    |Removed                     |Added
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                 CC|                            |ka.nick@mail.ru




--- Comment #7 from Nick <ka.nick@mail.ru>  2013-04-30 11:39:28 ---
Yes, I'm quite sure my laptop is mux-less, so I guess the card actually works
but cannot output anything... 
I've 1.13.4 installed (and 1.14.1 is available in portage softmasked). Is there
any chance I could make use of this?

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[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=47351





--- Comment #8 from Alex Deucher <alexdeucher@gmail.com>  2013-04-30 12:57:39 ---
(In reply to comment #7)
> Yes, I'm quite sure my laptop is mux-less, so I guess the card actually works
> but cannot output anything... 
> I've 1.13.4 installed (and 1.14.1 is available in portage softmasked). Is there
> any chance I could make use of this?

You can use xrandr to configure it using the -setprovideroutputsource and
-setprovideroffloadsink parameters

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[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=47351





--- Comment #9 from Nick <ka.nick@mail.ru>  2013-04-30 13:18:22 ---
Thank you!

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[Bug 47351] [KMS: Mobility Radeon HD 6620G] Blank screen on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=47351

Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Resolution|---                         |DOCUMENTED

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