Dall’ultimo dist-upgrade, 9.04 -> 9.10, mi succede questa cosa, e cioè i video che guardo nel portatile appaiono tutti virati al blu, con i colori palesemente incasinati.

Dopo aver dato la colpa ad un rippaggio errato del video, e soprattutto dopo essermi accorto del malfunzionamento anche in video che in passato si vedevano bene, ho indagato un poco, ed ecco cosa ho scoperto.

Dunque, i video non si vedono bene, con nessuno dei player installati nel sistema.

Lancio l’utility di configurazione della scheda nVidia e, senza modificare alcunché, il video si vede correttamente.

Chiudo l’utility della scheda video, chiudo il video e lo faccio ripartire, e colori sono nuovamente incasinati.

Lancio allora l’utility xvinfo, che riporta informazioni sul server X, e questo è il primo output:


X-Video Extension version 2.2
screen #0
Adaptor #0: "NV17 Video Texture"
number of ports: 32
port base: 280
operations supported: PutImage
supported visuals:
depth 24, visualID 0x21
depth 24, visualID 0x24
depth 24, visualID 0x25
depth 24, visualID 0x26
depth 24, visualID 0x27
depth 24, visualID 0x28
depth 24, visualID 0x29
depth 24, visualID 0x2a
depth 24, visualID 0x2b
depth 24, visualID 0x2c
depth 24, visualID 0x2d
depth 24, visualID 0x2e
depth 24, visualID 0x2f
depth 24, visualID 0x30
depth 24, visualID 0x31
depth 24, visualID 0x32
depth 24, visualID 0x33
depth 24, visualID 0x34
depth 24, visualID 0x35
depth 24, visualID 0x36
depth 24, visualID 0x37
depth 24, visualID 0x38
depth 24, visualID 0x39
depth 24, visualID 0x3a
depth 24, visualID 0x3b
depth 24, visualID 0x3c
depth 24, visualID 0x3d
depth 24, visualID 0x3e
depth 24, visualID 0x22
depth 24, visualID 0x3f
depth 24, visualID 0x40
depth 24, visualID 0x41
depth 24, visualID 0x42
depth 24, visualID 0x43
depth 24, visualID 0x44
depth 24, visualID 0x45
depth 24, visualID 0x46
depth 24, visualID 0x47
depth 24, visualID 0x48
depth 24, visualID 0x49
depth 24, visualID 0x4a
depth 24, visualID 0x4b
depth 24, visualID 0x4c
depth 24, visualID 0x4d
depth 24, visualID 0x4e
depth 24, visualID 0x4f
depth 24, visualID 0x50
depth 24, visualID 0x51
depth 24, visualID 0x52
depth 24, visualID 0x53
depth 24, visualID 0x54
depth 24, visualID 0x55
depth 24, visualID 0x56
depth 24, visualID 0x57
depth 24, visualID 0x58
depth 24, visualID 0x59
number of attributes: 7
"XV_SET_DEFAULTS" (range 0 to 0)
client settable attribute
"XV_ITURBT_709" (range 0 to 1)
client settable attribute
client gettable attribute (current value is 0)
"XV_SYNC_TO_VBLANK" (range 0 to 1)
client settable attribute
client gettable attribute (current value is 1)
"XV_BRIGHTNESS" (range -1000 to 1000)
client settable attribute
client gettable attribute (current value is 1)
"XV_CONTRAST" (range -1000 to 1000)
client settable attribute
client gettable attribute (current value is 0)
"XV_SATURATION" (range -1000 to 1000)
client settable attribute
client gettable attribute (current value is 0)
"XV_HUE" (range -1000 to 1000)
client settable attribute
client gettable attribute (current value is -1000)
maximum XvImage size: 2046 x 2046
Number of image formats: 4
id: 0x32595559 (YUY2)
guid: 59555932-0000-0010-8000-00aa00389b71
bits per pixel: 16
number of planes: 1
type: YUV (packed)
id: 0x32315659 (YV12)
guid: 59563132-0000-0010-8000-00aa00389b71
bits per pixel: 12
number of planes: 3
type: YUV (planar)
id: 0x59565955 (UYVY)
guid: 55595659-0000-0010-8000-00aa00389b71
bits per pixel: 16
number of planes: 1
type: YUV (packed)
id: 0x30323449 (I420)
guid: 49343230-0000-0010-8000-00aa00389b71
bits per pixel: 12
number of planes: 3
type: YUV (planar)

Lancio nuovamente l’utility nVidia, e poi di seguito xvinfo:


X-Video Extension version 2.2
screen #0
Adaptor #0: "NV17 Video Texture"
number of ports: 32
port base: 280
operations supported: PutImage
supported visuals:
depth 24, visualID 0x21
depth 24, visualID 0x24
depth 24, visualID 0x25
depth 24, visualID 0x26
depth 24, visualID 0x27
depth 24, visualID 0x28
depth 24, visualID 0x29
depth 24, visualID 0x2a
depth 24, visualID 0x2b
depth 24, visualID 0x2c
depth 24, visualID 0x2d
depth 24, visualID 0x2e
depth 24, visualID 0x2f
depth 24, visualID 0x30
depth 24, visualID 0x31
depth 24, visualID 0x32
depth 24, visualID 0x33
depth 24, visualID 0x34
depth 24, visualID 0x35
depth 24, visualID 0x36
depth 24, visualID 0x37
depth 24, visualID 0x38
depth 24, visualID 0x39
depth 24, visualID 0x3a
depth 24, visualID 0x3b
depth 24, visualID 0x3c
depth 24, visualID 0x3d
depth 24, visualID 0x3e
depth 24, visualID 0x22
depth 24, visualID 0x3f
depth 24, visualID 0x40
depth 24, visualID 0x41
depth 24, visualID 0x42
depth 24, visualID 0x43
depth 24, visualID 0x44
depth 24, visualID 0x45
depth 24, visualID 0x46
depth 24, visualID 0x47
depth 24, visualID 0x48
depth 24, visualID 0x49
depth 24, visualID 0x4a
depth 24, visualID 0x4b
depth 24, visualID 0x4c
depth 24, visualID 0x4d
depth 24, visualID 0x4e
depth 24, visualID 0x4f
depth 24, visualID 0x50
depth 24, visualID 0x51
depth 24, visualID 0x52
depth 24, visualID 0x53
depth 24, visualID 0x54
depth 24, visualID 0x55
depth 24, visualID 0x56
depth 24, visualID 0x57
depth 24, visualID 0x58
depth 24, visualID 0x59
number of attributes: 7
"XV_SET_DEFAULTS" (range 0 to 0)
client settable attribute
"XV_ITURBT_709" (range 0 to 1)
client settable attribute
client gettable attribute (current value is 0)
"XV_SYNC_TO_VBLANK" (range 0 to 1)
client settable attribute
client gettable attribute (current value is 1)
"XV_BRIGHTNESS" (range -1000 to 1000)
client settable attribute
client gettable attribute (current value is 0)
"XV_CONTRAST" (range -1000 to 1000)
client settable attribute
client gettable attribute (current value is 0)
"XV_SATURATION" (range -1000 to 1000)
client settable attribute
client gettable attribute (current value is 0)
"XV_HUE" (range -1000 to 1000)
client settable attribute
client gettable attribute (current value is 0)
maximum XvImage size: 2046 x 2046
Number of image formats: 4
id: 0x32595559 (YUY2)
guid: 59555932-0000-0010-8000-00aa00389b71
bits per pixel: 16
number of planes: 1
type: YUV (packed)
id: 0x32315659 (YV12)
guid: 59563132-0000-0010-8000-00aa00389b71
bits per pixel: 12
number of planes: 3
type: YUV (planar)
id: 0x59565955 (UYVY)
guid: 55595659-0000-0010-8000-00aa00389b71
bits per pixel: 16
number of planes: 1
type: YUV (packed)
id: 0x30323449 (I420)
guid: 49343230-0000-0010-8000-00aa00389b71
bits per pixel: 12
number of planes: 3
type: YUV (planar)

Dopo un diff tra i due output, ecco cosa emerge:


75c75
"XV_BRIGHTNESS" (range -1000 to 1000)
client settable attribute
< client gettable attribute (current value is 1) --- > client gettable attribute (current value is 0)
84c84
"XV_HUE" (range -1000 to 1000)
client settable attribute
< client gettable attribute (current value is -1000) --- > client gettable attribute (current value is 0)


E’ chiaro che i valori di colore e luminosità sono differenti, ed in particolare il primo potrebbe essere la causa della visualizzazione non corretta.
Ho cercato il modo di automatizzare l’impostazione agendo sul file xorg.conf, ma senza buoni risultati; l’unica soluzione semi permanente (non ho provato a rivedere un video dopo il reboot), è questa, valida per Totem, il mio videoplayer predefinito, ma applicabile anche agli altri, direi: Preferenze -> Visualizzazione -> Bilanciamento colore -> “Ripristina i valori predefiniti”.

Alla prox

[tags]ubuntu, nvidia, xv_hue[/tags]