powerbook VT garbled between rc7 and rc8

[Andreas Schwab]

Johannes Berg <johannes at sipsolutions.net> writes:

> On Fri, 2008-12-12 at 13:05 +0100, Andreas Schwab wrote:
>> Johannes Berg <johannes at sipsolutions.net> writes:
>> 
>> > After upgrading to -rc8 yesterday my powerbook started up today with the
>> > screen totally garbled, only occasionally was a word readable.
>> 
>> Try 6c34bc2976b30dc8b56392c020e25bae1f363cab (Revert "radeonfb:
>> accelerate imageblit and other improvements").
>
> That's post -rc8, ok, but -rc7 worked fine here, and the stuff it
> reverts is all pre -rc7, no? Strange. I'll try later.

This appears to be a side effect of setting up info->pixmap in
radeon_set_fbinfo even if accel_cexp is 0.  Alternatively to the cited
patch you can also use something like this:

diff --git a/drivers/video/aty/radeon_base.c b/drivers/video/aty/radeon_base.c
index d5b27f9..532e2c5 100644
--- a/drivers/video/aty/radeon_base.c
+++ b/drivers/video/aty/radeon_base.c
@@ -1895,6 +1895,9 @@ static int __devinit radeon_set_fbinfo (struct radeonfb_info *rinfo)
 	/* Allocate colormap */
 	fb_alloc_cmap(&info->cmap, 256, 0);
 
+	if (!accel_cexp)
+		goto bail;
+
 	/* Setup pixmap used for acceleration */
 #define PIXMAP_SIZE	(2048 * 4)
 

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab at suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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