On 2017-02-25 08:49, richard kweskin wrote: >> 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 > > 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 > > 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
Jeff Thinking a bit more about the lts.conf you submitted to the list: First, I assume you added this line to ensure that all clients would run in thin client mode. FAT_RAM_THRESHOLD=3000 Second, what lts.conf do you use for clients to run in fat client mode? I ask this to see if you continue to have the line X_COLOR_DEPTH=16 uncommented which is not the default for fat clients. They use 24 bit as a default, however, the bandwidth on the network takes a significant hit when 24 bit rather than 16 bit is used. 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
