Bug#664415: [solved] after upgrade xorg doesn't start correctly with radeon/vesa drivers - I can see only black screen and cursor

[Goga <goga777@bk.ru>]

> > [    65.686] (++) using VT number 7
> > 
> > [    65.711] (II) Loading /usr/lib/xorg/modules/drivers/radeon_drv.so
> 
> A more detailed description of the problem than just the subject line
> would have been nice, but my guess would be that the X server dies, and
> the log file ends abruptly at this point? 

yes, but in the log there is not useful info about of the reason such behaviour. Only after starting of X
from remote computer by ssh I could read the reason in console 

X: symbol lookup error: /usr/lib/xorg/modules/drivers/radeon_drv.so undefined symbol:
DrmCheckModeSettingSupport

after ldd /usr/lib/xorg/modules/drivers/radeon_drv.so I discovered that I have old version of libdrm
in /usr/lib

and new version in  /usr/lib/i386-linux-gnu/libdrm.so.2

I manually removed old lbdrm from usr/lib/ and after that I have

ldd /usr/lib/xorg/modules/drivers/radeon_drv.so
	linux-gate.so.1 =>  (0xb76f4000)
	libpixman-1.so.0 => /usr/lib/i386-linux-gnu/libpixman-1.so.0 (0xb7530000)
	libdrm_radeon.so.1 => /usr/lib/i386-linux-gnu/libdrm_radeon.so.1 (0xb7528000)
	libdrm.so.2 => /usr/lib/i386-linux-gnu/libdrm.so.2 (0xb751a000)
	libpciaccess.so.0 => /usr/lib/i386-linux-gnu/libpciaccess.so.0 (0xb750f000)
	libudev.so.0 => /lib/i386-linux-gnu/libudev.so.0 (0xb74ff000)
	librt.so.1 => /lib/i386-linux-gnu/i686/cmov/librt.so.1 (0xb74f6000)
	libc.so.6 => /lib/i386-linux-gnu/i686/cmov/libc.so.6 (0xb7399000)
	libm.so.6 => /lib/i386-linux-gnu/i686/cmov/libm.so.6 (0xb7372000)
	/lib/ld-linux.so.2 (0xb76f5000)
	libz.so.1 => /usr/lib/i386-linux-gnu/libz.so.1 (0xb735b000)
	libpthread.so.0 => /lib/i386-linux-gnu/i686/cmov/libpthread.so.0 (0xb7342000)


Now X starts without any problem

Question - is it possible to see such very important errors as I had 

X: symbol lookup error: /usr/lib/xorg/modules/drivers/radeon_drv.so undefined symbol:
DrmCheckModeSettingSupport

in xorg log ? It will drastically decrease the time for finding out of the problem.


> > After aptitude safe-upgrade aptitude full-upgrade I can't start X correctly. 
> 
> Which packages were upgraded?


ah - it was a lot of upgraded packages - several hundreds. I didn't save the list of them

thank you for your hint about stderr on remote computer

Goga