Re: viafb: XO-1.5 video broken on 2.6.39

Hi Daniel,

Daniel Drake schrieb:

Hi,

Commit fd3cc69848b7e1873e5f12bbcdd572b20277ecf3 breaks video on the
XO-1.5 laptop on 2.6.39:

Sorry about that.

commit fd3cc69848b7e1873e5f12bbcdd572b20277ecf3
Author: Florian Tobias Schandinat [off-list ref]
Date:   Fri Mar 11 00:04:01 2011 +0000

    viafb: remove duplicated clock storage

This is using the 1200x900 mode (DCON1200x900)

In the old code, the clock was hardcoded as value 57275000.
In the new code, the clock gets calculated as 1264x912x60 = 69166080

Having a closer look at it the entire mode looks suspicious as it is neither CVT 
nor GTF compatible. But as it worked I assume the timings are correct and only 
the refresh rate is incorrect. If we reduce the refresh rate to 50Hz we get
1264x912x50 = 57638400 which is pretty close to the old value (and the 
documentation about DCON I found also suggests that it works at 50Hz). I will 
prepare a patch as soon as I have time (the driver tends to assume that 60Gz 
mode is always present and working).

The result is that the screen gets filled with black and grey
horizontal lines instead of anything readable.

Any ideas?

Thanks,
Daniel

Thanks a lot for your bug report,

Florian Tobias Schandinat