[Bug 17747] New: Black screen on VGA output after "PLL adjustments" commit (92ee21df...)

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=17747

           Summary: Black screen on VGA output after "PLL adjustments"
                    commit (92ee21df...)
           Product: xorg
           Version: 7.4
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: twhitehead at gmail.com
         QAContact: xorg-team at lists.x.org


I upgraded my laptop to the latest Debian radeon driver and the VGA output
stopped working, so I got a copy of the git repository from freedesktop.org and
used git bisect to discover the first commit at which is stopped working was
"PLL adjustments" (92ee21df344a989778e37369c7beb3904a00ead6).

I'll attach a log file for the driver from the previous commit and this one for
starting up the server with the VGA output attached.  The difference between
them is:

--- radeon-0d5e0347af4322713075193154b8a348de4a0b52.log 2008-09-23
19:06:03.000000000 -0400
+++ radeon-92ee21df344a989778e37369c7beb3904a00ead6.log 2008-09-23
19:01:10.000000000 -0400
@@ -12,7 +12,7 @@
 Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
-(==) Log file: "/var/log/Xorg.0.log", Time: Tue Sep 23 19:04:13 2008
+(==) Log file: "/var/log/Xorg.0.log", Time: Tue Sep 23 19:00:41 2008
 (==) Using config file: "/etc/X11/xorg.conf"
 (==) ServerLayout "Default Layout"
 (**) |-->Screen "Default Screen" (0)
@@ -711,11 +711,11 @@
 (II) RADEON(0):   MC_AGP_LOCATION  : 0x003f0000
 freq: 146250000
 best_freq: 146250000
-best_feedback_div: 65
-best_ref_div: 2
-best_post_div: 6
+best_feedback_div: 1170
+best_ref_div: 27
+best_post_div: 8
 (II) RADEON(0): crtc(1) Clock: mode 146250, PLL 146250
-(II) RADEON(0): crtc(1) PLL  : refdiv 2, fbdiv 0x41(65), pdiv 6
+(II) RADEON(0): crtc(1) PLL  : refdiv 27, fbdiv 0x492(1170), pdiv 8
 Set CRTC PLL success
 Set CRTC Timing success
 Not using RMX

Thanks!  -Tyson


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