> From: richard kweskin [mailto:rkwesk_l...@hellug.gr] > Sent: Friday, February 24, 2017 3:57 PM > To: Donaldson Jeff > Cc: ltsp-discuss@lists.sourceforge.net > Subject: Re: [Ltsp-discuss] Fat Client Graphics Distortion > >> FROM: richard kweskin <rkwesk_l...@hellug.gr> >> SENT: Friday, February 24, 2017 4:03 AM >> TO: ltsp-discuss@lists.sourceforge.net >> CC: Donaldson Jeff >> SUBJECT: Re: [Ltsp-discuss] Fat Client Graphics Distortion >> >> On 2017-02-23 21:41, Donaldson Jeff wrote: >> > Greetings, >> > >> > I'm running an Edubuntu 12.04 LTSP server and I am having an >> issue >> > with my Fat Client image where drop down and dialog boxes appear >> with > distorted graphics. These work just fine on the thin client >> side so I > imagine it is a video driver problem in the chroot. The >> machines are > using an Intel 4 Series Chipset Integrated Graphics >> Controller. >> I've >> > tried installing the ppa:glasen/intel-driver repository and >> updating > the drivers, but that has no effect. I'm at a loss as to >> how to get > these to appear correctly. Any help or insight is >> appreciated. >> > >> > P.S. If it's not too much trouble, kindly reply to me as well as >> the > list to ensure I don't miss any replies due to my email >> rules. >> > Thanks! >> > >> > Regards, >> > Jeff >> >> Jeff >> >> I have no experience with the Intel 4 Series Chipset Integrated >> Graphics Controller so I googled it. Intel regards this as legacy >> hardware so adding a ppa seems pointless. >> >> One important place to check is to see what kernel video driver is >> in >> >> play. >> >> You report that when this client runs as a thin client all is well. >> Compare which video driver is in use both when in thin client mode >> and in fat client mode. If you want to see the kernel video driver >> use the command lspci -knn | grep -A2 VGA in a terminal. Take care, >> however, that while in fat client mode the command will apply to >> the >> client's hardware as stated above, but when in thin client this >> same >> procedure >> >> reports the server's kernel video driver! >> >> If you also have the Epoptes application on your server open it and >> right click on the thin client's icon and choose run -> open local >> admin terminal. Then the above command will apply to the client and >> not the >> >> server. >> >> If you do not have Epoptes (but you really should add it!) see >> >> http://wiki.ltsp.org/wiki/Troubleshooting#xterm_localapp [1] >> >> Troubleshooting - LTSPedia [2] >> wiki.ltsp.org >> This page is a stub, there should be some more information to >> provide >> a balanced overview of the topic. Help us make it complete. >> >> in order to then use the above command to see the thin client's >> kernel video driver. >> >> Please report back to the list what the above command shows in both >> modes when using the stock video driver and not the ppa one. >> >> Richard >> FROM: Donaldson Jeff >> SENT: Friday, February 24, 2017 12:02 PM >> TO: richard kweskin; ltsp-discuss@lists.sourceforge.net >> SUBJECT: Re: [Ltsp-discuss] Fat Client Graphics Distortion >> >> Richard, >> >> Thank you for the reply. When I run that command from the local >> console of a thin client, I get the following output: >> >> VGA compatible controller [0300]: Intel Corporation 4 Series Chipset >> Integrated Graphics Controller [8086:2e12] (rev 03) >> >> Subsystem: Dell Device [1028:0420] >> >> Kernel driver in use: i915 >> >> If I run the same command from the console of a fat client, I get >> the >> same results. So if they are using the same kernel video driver on >> the >> exact same hardware, why is one behaving differently than the other? >> Could it be a X issue? Also, if it helps...I've launched firefox >> from >> a terminal window to see if I encounter errors when accessing the >> drop >> downsdialog boxes and nothing appears in terminal. The machine is a >> Dell Optiplex 780. I've attached the lts.conf file and a picture so >> you can see the behavior. Any help is appreciated. Thanks! >> >> Regards, >> Jeff > On 2017-02-24 19:12, Donaldson Jeff wrote: >> Also, I forgot to include that I added the X_OPTION_01 = ""NoAccel"" >> to my lts.conf file and saw no change. It wasn't in the attached >> file >> I sent previously. Sorry about that. Thanks for any help you can >> provide. >> >> Regards, >> >> Jeff >> >> Jeff Donaldson >> Technology Director >> Newark Charter School >> jeff.donald...@ncs.k12.de.us >> (302) 369-2001 ext: 625 > > Jeff > > I have three more thoughts before I bow to those with more knowledge > on the subject. > > 1 - Check to see what kernel is in use in both modes. The command in > the terminal is > > uname -r > > Fat=3.2.0-123-generic-pae > Thin=3.2.0-123-generic-pae > > and show us the results please. > > 2 - Some pc's will use some main memory for the onboard graphics. > Check to see how much main memory and swap memory is used in both > modes. The command is > > free > > Fat=Used is 1.2gb out of 4gb. Swap is 0 > Thin=Used is 1.1gb out of 4gb. Swap is 0 > > and show us the results please. > > 3 - Your lts.conf shows that Gnome fallback session is used and at a > 16 bit color depth. What resolutions are offered and which one do you > use and at what refresh rate? Experiment with X_COLOR_DEPTH=8 and > with > X_COLOR_DEPTH=24 in lts.conf to see what changes you see (if any.) > > Richard On 2017-02-27 21:14, Donaldson Jeff wrote: > Richard, > > Thanks for the reply. I checked the kernel version and the memory, > and then tested the color depth. It seems that switching to 24 bit > has > fixed the problem in initial tests. Thanks for the heads up! > > Regards, > Jeff > > Jeff Donaldson > Technology Director > Newark Charter School > jeff.donald...@ncs.k12.de.us > (302) 369-2001 ext:625
Jeff That's great that your problem is solved. Hopefully you are using 24 bit color depth only with the fat clients, since thin clients are constantly demanding network traffic to and from the server and increasing their color depth will adversly affect the network bandwidth. Richard ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net
