[Bug 21489] New: Color depths less than 24-bit result in useless malformed screen output

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=21489

           Summary: Color depths less than 24-bit result in useless
                    malformed screen output
           Product: xorg
           Version: 7.4
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: joacim at olex.no
         QAContact: xorg-team at lists.x.org


Created an attachment (id=25297)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=25297)
xorg.conf for 8-bit test 

I'm testing Fedora 11 Preview with the xorg-x11-drv-ati-6.12.2-4.fc11.rpm.

Hardware: Thinkpad T43 with ATI Radeon M22 (Mobility Radeon X300).

Running default Fedora installation with no xorg.conf and 24-bit color depth
gives a very nice and fully working screen output from Xorg.

Test with different combinations of depth and xorg.conf:

24-bit & no xorg.conf (Fedora default) 
 => Fully working.
24-bit & my xorg.conf 
 => Fully working.
16-bit & my xorg.conf 
 => Greenish (color palette seems shifted) with 4 Xorg-root windows skewed and
lower part of screen flickering sometimes and seems to show old screen outputs?
8-bit & my xorg.conf 
 => Black Xorg-root window and only mouse cursor visible. But it seems to hide
there behind the blackness since the mouser cursor changes appearance where the
terminal should be (running twm).

The only difference between "my xorg.conf" in the three tests are the
DefaultDepth value.

My system worked well on Fedora 9 (don't remember the ati driver version).

My guess is that code changes to the ati driver due to change in acceleration
methods and maybe VT switching are the source to this bug. If so is the code
for handling color depths less than 24-bit also being worked on? I saw no signs
of 8-bit or 16-bit color depth mentioned in the Changelog. If this kind of code
priority has happende, please let me know.

I'll do these tests again on a clean Fedora 11 Preview installation without our
software installed to remove the possibility for some obscure self made
environment catalyzing this bug. :-)


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