Hi,
I updated KDE today to the last version (kdelibs5-dev:amd64 4:4.10.2-0ubuntu2.2; Kubuntu 13.04) and since then the external screen of my laptop shows nothing using either VGA or HDMI cable (the screen is Acer S273HL LCD). The screen does show up when Grub and then Kubuntu load up, but it turns black after logging in.

Anyone else encountered it? any suggestions?

Thanks in advance,
Roey

kms, fails with at least the radeon driver and a pretty dated r100 chip here (not very important to me so i didn't check on)
Not KDE related, esp. not if it happens during the boot process (usually when kms kicks in) - the "dated" thing that does this for me won't run KDE (boots from USB1.1 - takes two minutes until fluxbox is up and 30 seconds for xterm, ie. moving data from USB to RAM is too expensive)

Unfortunately radeon.modeset=0 will caus the kernel module to fail loading altogether (here) so you cannot even deactivate kms to keep the screen enabled.

If it fails out when logging in but still functions at the login screen (prior to first login) this indicates that KScreen may be disabling the display.
Please make sure it is enabled - you can access the KScreen settings by running "kcmshell4 kscreen".

Well I managed to bypass it for now by using a VGA cable rather than an HDMI. VGA gives no prob.
I cannot check Kscreen configuration because as soon as I plug in the HDMI cable also the laptop screen goes black.

Can you take a look for a folder named 'kscreen' in ~/.kde4/share/apps and post the contents of it please?
Also, take a look for a ~/.kde4/share/config/kscreenrc and post the content of that file as well please.

Contents of:

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$ ll ~/.kde/share/apps/kscreen/

(no ~/.kde4 dir on my machine)

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total 20K
-rw-rw-r-- 1 angel angel 818 May 29 20:16 09e168f108eeaffd211577a319cc417f
-rw-rw-r-- 1 angel angel 289 Jun  4 23:46 214f6413d557649cc6002256fa8f2362
-rw-rw-r-- 1 angel angel 591 May 30 12:10 947a989ed0e5c88ee2649fedde9a3aad
-rw-rw-r-- 1 angel angel 438 May 29 20:05 b0066f79033b863df524f5dfb8b8daf4
-rw-rw-r-- 1 angel angel 505 Apr 25 16:45 eea685e551c231449b7b6230f995f443


No kscreenrc directory on my machine

Running Kubuntu 13.04

Thanks again!
Roey

Can you provide the contents of those files if possible?
They likely contain the information needed to identify your various configurations and the screens which form part of it (along with their settings).

Sure!

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$ ll ~/.kde/share/apps/kscreen/
total 20K
-rw-rw-r-- 1 angel angel 818 May 29 20:16 09e168f108eeaffd211577a319cc417f
-rw-rw-r-- 1 angel angel 289 Jun  4 23:46 214f6413d557649cc6002256fa8f2362
-rw-rw-r-- 1 angel angel 591 May 30 12:10 947a989ed0e5c88ee2649fedde9a3aad
-rw-rw-r-- 1 angel angel 438 May 29 20:05 b0066f79033b863df524f5dfb8b8daf4
-rw-rw-r-- 1 angel angel 505 Apr 25 16:45 eea685e551c231449b7b6230f995f443


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$ cat ~/.kde/share/apps/kscreen/09e168f108eeaffd211577a319cc417f; echo
[ { "enabled" : false, "id" : "43e2b9b2289e1e82a41193b406952b05", "metadata" : { "fullname" : "xrandr-Acer Technologies-S273HL-LQA0C0158000", "name" : "HDMI3" }, "pos" : { "x" : 0, "y" : 0 }, "primary" : false, "rotation" : 1 }, { "enabled" : true, "id" : "6b503d5cddc7e4bdd019d529b565b8a2", "metadata" : { "fullname" : "xrandr-Lenovo Group Limited", "name" : "LVDS1" }, "mode" : { "refresh" : 60.0033, "size" : { "height" : 800, "width" : 1280 } }, "pos" : { "x" : 0, "y" : 0 }, "primary" : true, "rotation" : 1 }, { "enabled" : true, "id" : "3db8db6c1e8c44601d3aba22b39bd079", "metadata" : { "fullname" : "xrandr-Acer Technologies-S273HL-LQA0C0158000", "name" : "VGA1" }, "mode" : { "refresh" : 60.0, "size" : { "height" : 1080, "width" : 1920 } }, "pos" : { "x" : 0, "y" : 0 }, "primary" : false, "rotation" : 1 } ]

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cat ~/.kde/share/apps/kscreen/214f6413d557649cc6002256fa8f2362; echo
[ { "enabled" : true, "id" : "6b503d5cddc7e4bdd019d529b565b8a2", "metadata" : { "fullname" : "xrandr-Lenovo Group Limited", "name" : "LVDS1" }, "mode" : { "refresh" : 60.0033, "size" : { "height" : 800, "width" : 1280 } }, "pos" : { "x" : 0, "y" : 0 }, "primary" : true, "rotation" : 1 } ]


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$ cat ~/.kde/share/apps/kscreen/947a989ed0e5c88ee2649fedde9a3aad; echo
[ { "enabled" : true, "id" : "6b503d5cddc7e4bdd019d529b565b8a2", "metadata" : { "fullname" : "xrandr-Lenovo Group Limited", "name" : "LVDS1" }, "mode" : { "refresh" : 60.0033, "size" : { "height" : 800, "width" : 1280 } }, "pos" : { "x" : 0, "y" : 0 }, "primary" : true, "rotation" : 1 }, { "enabled" : true, "id" : "3db8db6c1e8c44601d3aba22b39bd079", "metadata" : { "fullname" : "xrandr-Acer Technologies-S273HL-LQA0C0158000", "name" : "VGA1" }, "mode" : { "refresh" : 60.0, "size" : { "height" : 1080, "width" : 1920 } }, "pos" : { "x" : 0, "y" : 0 }, "primary" : false, "rotation" : 1 } ]


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$ cat ~/.kde/share/apps/kscreen/b0066f79033b863df524f5dfb8b8daf4; echo
[ { "enabled" : false, "id" : "43e2b9b2289e1e82a41193b406952b05", "metadata" : { "fullname" : "xrandr-Acer Technologies-S273HL-LQA0C0158000", "name" : "HDMI3" }, "pos" : { "x" : 0, "y" : 0 }, "primary" : false, "rotation" : 1 }, { "enabled" : false, "id" : "6b503d5cddc7e4bdd019d529b565b8a2", "metadata" : { "fullname" : "xrandr-Lenovo Group Limited", "name" : "LVDS1" }, "pos" : { "x" : 0, "y" : 0 }, "primary" : true, "rotation" : 1 } ]


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$ cat ~/.kde/share/apps/kscreen/eea685e551c231449b7b6230f995f443; echo
[ { "enabled" : false, "id" : "6b503d5cddc7e4bdd019d529b565b8a2", "metadata" : { "fullname" : "xrandr-Lenovo Group Limited", "name" : "LVDS1" }, "pos" : { "x" : 0, "y" : 0 }, "primary" : false, "rotation" : 1 }, { "enabled" : true, "id" : "9a78952c6566a67484b692bb8051f147", "metadata" : { "fullname" : "xrandr-Dell-DELL S2409W-U946D91N1H3U", "name" : "VGA1" }, "mode" : { "refresh" : 60.0, "size" : { "height" : 1080, "width" : 1920 } }, "pos" : { "x" : 0, "y" : 0 }, "primary" : true, "rotation" : 1 } ]


Thanks a lot!

After the last updates things are back to normal.

Thanks a lot for all the effort

Roey

Not a problem. Would be interesting to know what packages the update affected (ie. was it a KDE or a X bug).