X - SLS/d - Single Logical Screen/Distributed problem

[Misha Rekhson]

Hi - I have been trying to get single distributed logical screen on two B180L running HP-UX 10.20 but have not succeeded so far.

After I patched all the X related stuff as far as I can, I am stuck with slave starting up, but the Master dying with the following:

....
[VISCENTER NOTE ] Using video timing format: 1280x1024 @ 75Hz
[VISCENTER NOTE ] Starting Slave: emu-n1:50 (HP VISUALIZE-EG Color)
X Error of failed request: BadAccess (attempt to access private resource denied)
Major opcode of failed request: 89 (X_StoreColors)
Serial number of failed request: 8
Current serial number in output stream: 9

(The slave seems to start OK - i.e., X background comes on, etc)

I've tried a variety of things, but has not been able to get passed this? Must be something obvious...


Thank you very much,
Misha

[Dietmar Konermann]

Hi, Misha!

Do both B180L use the same graphics adapter (VIZUALIZE-EG)? The only known occurences of your error I found were caused by a different architecture of newer display cards.

The default colormap has allocated a transparent color in addition to black and white. Since black and white use index 0 and 1, and transparent uses index 255, this makes it impossible to allocate 7 planes of contiguous colors, even though 252 colors are still available.

One of the proposed workarounds is using DisableDefaultCmapTransparency.

Maybe that helps for you also...

Dietmar.

[Alex Glennie]

/usr/lib/X11/Xserver/info/screens/hp
details how to set this up correctly ... also of use if you still have problems will be the output from running "/bin/graphinfo on both systems and posting the results ?

Also out of interest are both cards configured to be using the same default visual ie both Truecolor or Pseudocolor ?

[Misha Rekhson]

It was not the case of different graphics cards/patch levels - the same error was happening in a degenerate case of 1x1, i.e., one slave server.

I guess the problem was in some strange interaction of various X patches and the order of their application. Everything claimed to be at the latest patch level, yet didn't work.

I finally gave up and made clean builds, applied ACE bundles and some subsequent patches, and voila, it worked as advertised

thanks for your suggestions.

[Misha Rekhson]

An Update: In the end it appears to be a bug with Visuzlie-EG as SLS/d slaves, introduced in June 01 X server patch on 10.20 (it also fails on HP-UX 11.11)

HP has duplicated the problem, and the lab is looking into it...