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Once again. Same problem here. Could it be the case that this is an issue with hsync? Data is being rendered correctly, but the signal that is being fed to the monitor is corrupted, indicating synchronization problems.
So I suppose that the current solution is to wait for 8.7?
maligor, is the issue with Savege 2 login screen a regression from previous driver versions ? We're always looking for "easy to reproduce" problems where there's a good chance we might see them on our systems and not have to drive to your house
Well, if you want to see the screen corruption i could take my pc and drive to you . According to googlemaps it would be less than an hour to Starnberg, which is what the fglrx driver says:
Just got bitten by the same issue, on AMD64 (Ubuntu 8.04). Just bought a new HD4850, but if I'd known the card was unusable with MythTV I'd not have bought it just yet...
Anyways, I agree with what one of the previous posters said, it appears to be an issue with horizontal sync / pixelclock. I have tried MythTV on every available resolution that my TV supports, and the checkerboard pattern varied in size accordingly:
1360x768 (max for my screen): about 10 chunks, blacks moving from upper right to lower left
1280x768: same 10 chunks, but moving from upper left to lower right
800x600: only about 6 chunks, moving right to left again
I have tried with some Wine games as well, and found that corruption caused by Wine games is non-recoverable. With MythTV, all I had to do was quit the app, and the screen would restore itself to normal. But with Wine (even when run in windowed mode, so no resolution changes), I had to do a ctrl-alt-backspace to get my normal screen back.
mplayer works fine for me, with both x11 and xv output. I also tried different settings for GLOverlay and VideoOverlay, but that changed nothing. Obivously, I can't test with 8.5 drivers because they don't support my card...
Cool. Must have missed that one. Indeed, telling mythtv to use 1359x768+1+0 fixes the corruption, but also makes it appear below the taskbar. But at least it's usable. Makes me curious about what the real reason for this bug is...
Curious thing: running mythfrontend in a window (using mythfrontend.real -w) causes the same corruption unless you provide the geometry workaround. So it's not (just) a full-screen issue.
Anyone else noticed screen flicker before the corruption sets in? It's almost like fglrx tries to switch to a new resolution, then decides that it can't or won't, and corrupts the screen in the process...
In general Catalyst 8.6 seems much slower on my mobile X1200 (RX690M) based ATi graphics chip. 8.5 was a tad faster (not by much, though), and feels especially sluggish in 2D (and even AIGLX, like some effects with Compiz Fusion [rotate-cube, close-window-effect [fire], etc])