Travar a máquina por causa de um simples cliente de email deve ser sintoma de outra coisa. Isso não é normal. Ou você está com algum problema de hardware ou com aceleração de vídeo.
Sim, esta parece ser a opinião mais correta, (para o Kmail) visto que o problema está ocorrendo somente no PC antigo. Contudo, o Evolution não está travando nos equipamentos novos mas não para de abrir uma maRdita janelinha pedindo senha.
Um fato que ocorre com o Kmail:
Na primeira vez, chamar o Kmail pelo prompt de comando, não aparecem mensagens de erro.
Mas, se o Kmail foi fechado após ocorrer um travamento e abrir novamente pelo prompt...Dá uma olhado na pá de mensagens...
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
kmail(4172)/kdeui (Wallet): The kwalletd service has been disabled
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "QLocalSocket::connectToServer: Invalid name"
kmail(4172) KMFolderIndex::updateIndexStreamPtr: utime( "/home/sergio/.kde4/share/apps/kmail/mail/.inbox.index.ids" , 0) failed (KMMsgDict::getFolderIdsLocation( *this ))
kmail(4172) KMKernel::recoverDeadLetters: Autosave directory "/home/sergio/.kde4/share/apps/kmail/autosave/cur" not found!
kmail(4172)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "Unsupported operation (2)": "Invalid model"
"/usr/bin/kmail(4172)" Error in thread 2990429920 : "Invalid iterator."
kmail(4172)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
[sergio@localhost ~]$ QPainter::end: Painter ended with 2 saved states
kmail(4172)/kio (KIOJob) KIO::TransferJob::slotData: mimetype() not emitted when sending first data!; job URL = KUrl("pop3s://sergelli%40uol.com.br@pop3.uol.com.br:995/index") data size = 0
kmail(4172)/kio (KIOJob) KIO::TransferJob::slotData: mimetype() not emitted when sending first data!; job URL = KUrl("pop3s://sergelli%40uol.com.br@pop3.uol.com.br:995/uidl") data size = 0
kmail(4172)/kio (KIOJob) KIO::TransferJob::slotData: mimetype() not emitted when sending first data!; job URL = KUrl("pop3s://sergelli%40uol.com.br@pop3.uol.com.br:995/download/") data size = 0