* Radeon 7500 framebuffer garbled on 2.4.19
@ 2002-10-07 20:31 J.P. Morris
0 siblings, 0 replies; only message in thread
From: J.P. Morris @ 2002-10-07 20:31 UTC (permalink / raw)
To: LKML
There appears to be a problem with the ATI fbdev on the Radeon 7500
under the 2.4.19 kernel. I haven't yet tried older vintages.
The 8-bit colour modes work, but high and truecolour modes are garbled.
The effect is difficult to describe, but I'll try. The colours are being
shifted oddly. Greyscale images appear as a mixture of various colours with
little apparent logic.. largely dark purple but with sparkles of yellow etc.
When a full-colour image is displayed, it appears almost (but not quite) in
green-levels. If the image is faded to black, the colours go wild.
Displaying the RGB scales proved quite interesting.. the three scales appear
at maximum intensity, but there are gaps. For the main part, each alternate
level is missing giving a comb-tooth effect. Some of the 'teeth' are at
half-intensity and some of the 'teeth' are not missing but haven't changed
intensity either.
The same basic pattern happens on 15,16 and 32 bpp modes.
SVGALIB doesn't suffer from this problem at all. If I were more technically
inclined I'd go through the sources and compare the two.. but all I've found
so far is that I haven't a clue how a register-level display driver works. ;-(
Any ideas? Comments?
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2002-10-07 20:26 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2002-10-07 20:31 Radeon 7500 framebuffer garbled on 2.4.19 J.P. Morris
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®